vegetable
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Yacon

Smallanthus sonchifolius

Yacon is a striking Andean crop producing huge crisp, sweet tubers that taste like a cross between apple and pear. Plant divisions or potted plants in late May after frosts, into rich moist soil with plenty of compost. Plants grow into 1.5–2m sunflower relatives over summer — give them space and shelter from wind. Harvest in October or November once frost blackens the tops: separate the small reddish 'crown' tubers (replant or store for next year) from the large eating tubers underneath. Eating tubers sweeten dramatically after a week in the sun. Brilliant grated raw in salads or juiced. A novel, easy crop with virtually no UK pest problems.

Plan where to grow Yacon using our vegetable garden planner.

SunlightFull sun
WateringModerate
Height1.8m
Spacing80cm
GerminationPlant divisions
Sowing MethodUnder cover
Frost HardinessTender
Sowing DepthCrown at soil level

When to Sow Yacon

Sow yacon in May, June.

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Sowing months

Time to Harvest Yacon

Expect to harvest approximately 5 months after sowing.

Companion Plants

Expected Yield

A single plant produces 4–8kg of tubers in a good year.

Common Problems with Yacon

Small tubers

Yacon needs a long warm season and rich soil. Start in pots in April, plant out in June, and mulch with compost monthly.

Wind damage to tall stems

Stems are brittle and snap easily. Plant in a sheltered spot or stake stems by midsummer.

Tubers not sweet enough

Sun-cure lifted tubers for 7–14 days in a sunny porch or greenhouse — starches convert to sugars and flavour improves enormously.

Plan your yacon in the allotment planner

Drag and drop plants onto your plot and get personalised sowing reminders.

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